Dental-inlay-casting machine.



E. M. FREDERIGKS. DENTAL INLAY CASTING MACHINE.

APPLIOATION FILED MAE. 7, 1908.

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' producing certain articles or devices required compressed air, and in such a manner as to construct the machine that flasks of various ing other arts of. the machine.

useful Improvements in a Dental-Inlay-Castto one another that in the operation'of form- ENOGH M. FREDERICKS, OF CHICAGO, ILLINOIS.

' DENTAL-INLAY-CASTIN G MACHINE.

Specification of Letters Patent.

Patented May 4, 1909.

Application filed March 7, 1908. Serial No. 419,721.

To all whom iii-may concern:

Be it known that I, ENooH M. FREDER- IOKS, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and ing Machine, of which the following is a specification. I

This invention relates to improvements in a machine to be employed by dentists for in their work, and while it is more es ecially intended to be used for casting denta inlays of metal, yet it is applicable for'casting toothcrowns, bridges and clasps and it consists in certain peculiarities of the construction, novel arrangement, and operation of the various arts thereof, as will be hereinafter more ully set forth and specifically claimed.

The principal object of the invention is to provide a machine for casting dental inlays and the like, which shall be simple and inexpensive in construction, strong, durable and effective in operation, the parts of which shall be so made and arranged with respect in the casting the gold or other material wil be forced into the matrix by means of readily and quickly provide inlays or castings which shall -b.e perfect and without flaws.

Another object of the invention is to so sizes for holding the investing material may e employed without the necessity'of chang- Other 0 )jects and advantages of the invention will be disclosed in the subjoincd description and explanation.

In order to enable others skilled in the art to which my invention pertains, to make and use the same, I will now. proceed to describe it, referring to the accompanying drawing, in which- Figure 1 is a view in side elevation of acasting machine embodying the invention, showing the parts in the positions they will assume when ready to apply pressure to the molten metal or liquii materialout of which the casting is made Fig. 2 is a central vertical sectional view of the device, showing by continuous lines the parts in the ositions illustrated in Fig. 1 and by dotted 'nes the positions to which they maybe moved in the act of applying compressed air to the flask,

Like numerals of reference, refer to corresponding parts throughout the different views of the drawing.

The reference numeral. 5 designates the base of the machine, which may be made of any'suitable size, 'sha e and material, but preferably of metal an( rectangular in shape, and with supporting-legs 6 at each of its corners. Near one of its ends the base 5 is provided with an upwardly extending proection 7 to which is )ivotally secured at its lower end a link 8, the upper end of which has ivotally secured thereto one end of the ban -lever 9 the other end of which may be provided with a handle 10, of any suitable material. The hand-lever 9 is rovided near its middle with an opening 1]."for the reception and operation of a depending neck or extension 12 on the internally screw- .threaded cap 13 of the air compressor or cylinder 14, which has its lower portion'externally screw threaded to engage the threads of the cap 13, as will be readily understood by reference to Fig. 2 of the drawing. The neck 12 is pivotally secured to the hand-lever 9 within the opening 11 thereof, which opening is slightly elongated to permit of the free movement of the neck when the handle is turned on its fulcrum. Fitted in the cylinder 14 is a piston 15 which has at its periphery suitable packing 16, and

is provided centrally with a hollow piston lO( 17 which extends through the neck or extension12 and has on its lower end an inverted hollow platcor cup 18 to fit on the top of the flask 19, whiohniay be made of an suitable size and shape, but preferably cy indrical and with each of its ends open.

As shown in Fig. 2 of the drawing the plate 18 is provided on its lower surface with an annular recess 20 in which is located packing 21, of any suitable heat resisting material such as asbestos. By providing the plate 18, which it will be understood may be of any desired sha e, with a recess or cavity 20 in its lower sur ace, which recess extends from'near the center of the plate to near'its outer edges, that flasks 19 of different sizes and shapes may be used in connection therewith and thatthe packing 21 in the recess will tightly close the upper end of the flask. At a suitable point, to be directly beneath the piston-rod 17 when in its operative position, the base 5 is provided with cylinder 14 and seated at one of its ends in e top thereof is a spring 25, the other end I of which is seated against the inner or upper surface of the piston 15 and serves to normally hold the latter and its piston-rod 17 in their projected positions, thus permitting the cylinder 14 to be filled with air through the 0 ening in the piston-rod.

Fu crumed on the plate 18 is a bell-crankieVer, the shorter arm 26 of which is provided with a longitudinally extending slot 27 to receive a pin-28 on the cap 13 of the compression cylinder. The longer arm 29 of the bell-crank-lever is pivotally connected 1 at its free end to the projection 7 on the base of the machine. By employing the bellcrank-lever and connecting it to the parts 7,

13, and 18 as above set forth, it is evident that in the act of applying compressed air to the fiask 19 the 'compression cylinder 14 and the piston-rod 17 will be held in a true vertical position, thus causing the plate 18 to properly fit on the top of the flask so as to prevent the esca e of air. To form a rest orsupport for t ie link 8 and the other member 0 the machine which it carries when the parts are raised to the positions shown by dotted lines at the left of Fig. 2, the base 5 may be provided with an upward extension 29 at its end adjacent to the projection 7 to which the link 8 is secured.

The flask 19 may be provided with a mold or matrix 30 of the desired shape in the preferred or any well known manner, but in Figs. 2 and 3 of the drawing 1. have shown one method of doing the same, which consists in producing a wax model 30 of the shape of tliecavity to be iilled or of the form of the desired casting, and' attaching thereto a sprue-rod or former 31 which may be suspended in the flash 1!), when suitable investing material 32, such as asbestos and plaster of paris, may 'be placed in the flask around the model 30 and sprue-rod 31, and after the same has become set or hardened the rod 31 may be removed, thus leaving the sprue 33 which leads from the model to a cavity 34 formed in the upper portion of the investing material, in which gold or other matcrialout of which it is desired to form the casting may be placed, when by heating the flash the wax model will be caused to melt and will be evaporated or absorbed into the investing material, thus leaving the matrix 30 open to receive the metal or other material. When the metal has been melted the plate 18 is placed on the top of the flask 19, when, by forcing the hand-lever 9 downwardly in the direction shown by dotted lines at 35 of Fig. 2, the air in the cylinder 14% will be compressed and supplied through the hollow piston-rod 17 to the cavity in the upper portion of the flask, thus forcing the molten metal or liquid. material into the matrix to form the desired casting or inlay.

less porous, and as it will rest closely on the upper surface of the ilftSK-llOldt-H 24, I prefer to provide the'extension 23 on the flaskholder with an opening for the passage of ai'r confined in the matrix, thus permitting the material out of which the casting is being perfections. i

From the above description of my, improvements it will be understood that the device is susceptible of considerable modification without material departure from the this reason I do not desire' to be understood as limiting myself to'the precise form and arrangement of the several parts of the device as herein set forth in carrying out my invention in practice. l v

Having thus fully described my invention, what I claim as new, and desire to secure by Letters-Patent, is

'1. The combination with a base, of a hand lever loosely connectedthereto at one of its ends, an air compression cylinder connected to the handdever between its ends, a piston in said cylinder, a hollow piston-rod connectat its other end a plate, and a flask adapted for location on the base so as to have its upper end closed by said plate.

lever loosely connected thereto at one of its ends, an air compression cylinder P1V0titll) connected to the handnever between its 1 ton-rod connected at.0ue of its ends to the piston and having at its other end aplate, means connecting the base, said plate and the compression cylinder whereby the pistonr'od and plate will have a true vertical movement in the downward movement of the hand-lever, and flask adapted for location on the base so as to have its top closed by said plate. 3. The combination with a base, of a handlever loosely connected theretoat one of its ends and having an openingintermediate of its ends, an air compression cylinder having on its lower portion an extension pivotally secured in the opening of the hand-lever, a 1 piston in said cylinder, a hollow piston-rod 1 connected at one of its ends to the piston and 1 having at its other em a plate provided on formed to fill the same without flaws or im principles and spirit of the invention, and for ed at one of its endsto the piston and having a '2. The combination with a base, of a handends, a piston in said cylinder, a hollow pis' As the investing material 32 is more or its lower surface with packing, and a flask adapted for location on the base so as to have its upper end-closed by said plate.

4. The combination with a base, of a handlever loosely connected at one of its ends thereto and having an opening intermediate of its ends, an air compression cylinder having an extension on its lower portion pivotally secured in the opening of the hand-lever, a spring-actuated piston in the cylinder, a hollow piston-rod connected at one of its ends to the piston and having at its other end a plate provided on its lower surface with packing, a bell-crank-lever fulcrunied on said plate and having one of its arms pivotally connected to a support on the base and its other arm in loose engagement with the cylinder, and a flask adapted for location on the base so as to have its top closed by said plate. i

5. The combination with a base having} near one of its ends an upwardly extending projection and near its other end an opening, a link pivotall secured at its lower end to said projection, a hand-lever pivoted at one of its ends to the upper end of the link and having an opening between its ends, an air compression cylinder having on its lower portion an extension pivotallvsecured in the opening of the hand-lever, a spring-actuated piston in said cylinder, a hollow piston-rod connected at one of its ends to the piston and having on its other end a plate provided on its lower surface with a recess, cushioning material located in said recess, a flask-holder having an aperturcd extension fitted in the opening of the base, and a flask mounted on said holder.

ENOOH M. FREDERICKS. \Vitnesses CHAS. A. TILLMAN, M'. A. NYMAN.

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